<template>
  <div>
      <!-- 面包屑导航区域 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>权限管理</el-breadcrumb-item>
        <el-breadcrumb-item>角色列表</el-breadcrumb-item>
      </el-breadcrumb>

      <!-- 卡片视图区域 -->
      <el-card>
        <!-- 搜索与添加区域 -->
        <el-row :gutter='20'>
            <el-col :span='4'>
                <el-button type="primary" @click="addDialogVisible = true">添加角色</el-button>
            </el-col>
        </el-row>
        <!-- 角色列表区域 -->
        <el-table :data="rolesList" border stripe>
          <!-- 展开列 -->
          <el-table-column type="expand">
              <template slot-scope="scope">
                  <el-row :class="['vcenter','bdbottom',i1===0?'bdtop':'']" v-for="(item1,i1) in scope.row.children" :key="item1.id">
                      <!-- 渲染一级权限 -->
                      <el-col :span="5">
                          <el-tag closable @close="removeRightsById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                          <i class="el-icon-caret-right"></i>
                      </el-col>
                      <!-- 渲染二级和三级权限 -->
                      <el-col :span="19">
                          <el-row :class="['vcenter',i2===0?'':'bdtop']" v-for="(item2,i2) in item1.children" :key="item2.id">
                            <!-- 渲染二级权限 -->
                            <el-col :span="6">
                                <el-tag closable @close="removeRightsById(scope.row,item2.id)" type="success">{{item2.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染三级权限 -->
                            <el-col :span="18">
                                <el-tag @close="removeRightsById(scope.row,item3.id)" type="warning" v-for="item3 in item2.children" :key="item3.id" closable>
                                    {{item3.authName}}
                                </el-tag>
                            </el-col>
                        </el-row>
                      </el-col>
                  </el-row>
              </template>
          </el-table-column>
          <!-- 索引列 -->
          <el-table-column label="#" type="index"></el-table-column>
          <el-table-column prop="roleName" label="角色名称"></el-table-column>
          <el-table-column prop="roleDesc" label="角色描述"></el-table-column>
          <el-table-column label="操作" width="300px">
            <template slot-scope="scope">
              <!-- 修改按钮 -->
              <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.id)">编辑</el-button>
              <!-- 删除按钮 -->
              <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeUserById(scope.row.id)">删除</el-button>
              <!-- 分配权限按钮 -->
              <el-button type="warning" icon="el-icon-setting" size="mini" @click="showSetRightsDialog(scope.row)">分配权限 </el-button>
            </template>
          </el-table-column>
        </el-table>
      </el-card>

      <!-- 分配权限的对话框 -->
      <el-dialog title="权限分配" :visible.sync="setRightsDialogVisible" width="50%" @close="SetRightDialogVisibleClosed">
        <el-tree :data="rightsList" :props="treeProps" show-checkbox node-key="id" default-expand-all
         :default-checked-keys="defaultKeys" ref="treeRef"></el-tree>
        <span slot="footer" class="dialog-footer">
            <el-button @click="setRightsDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="allotRights">确 定</el-button>
        </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 角色列表
      rolesList: [],
      // 所有权限的数据
      rightsList: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 控制权限分配对话框的显示与隐藏
      setRightsDialogVisible: false,
      // 默认选中的节点的Id数组
      defaultKeys: [],
      // 当前即将分配权限角色的Id
      roleId: ''
    }
  },
  created () {
    // 获取所有角色
    this.getRolesList()
  },
  methods: {
    // 获取角色列表
    async getRolesList () {
      const { data: res } = await this.$http.get('roles')
      // console.log(res)
      if (res.meta.status !== 200) return this.$message.error('获取角色失败')
      // this.$message.success('获取权限成功')
      this.rolesList = res.data
    },
    // 根据ID删除对应的权限
    async removeRightsById (roles, rightsId) {
      // 弹框询问是否删除用户
      const confirmResult = await this.$confirm('此操作将永久删除权限, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 如果确定删除，返回 confirm
      // 如果取消删除，返回 cancel
      if (confirmResult !== 'confirm') return this.$message.info('已取消删除')
      const { data: res } = await this.$http.delete(`roles/${roles.id}/rights/${rightsId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败')
      }
      // this.$message.success('删除权限成功')
      roles.children = res.data
    },
    // 展示分配权限的对话框
    async showSetRightsDialog (roles) {
      this.rolesId = roles.id
      // 获取所有权限数据
      const { data: res } = await this.$http.get('rights/tree')
      // console.log(res)
      if (res.meta.status !== 200) return this.$message.error('获取权限失败')
      // this.$message.success('获取权限成功')
      this.rightsList = res.data
      // this.defaultKeys = []
      // 递归形式获取三级权限Id
      this.getLeafKeys(roles, this.defaultKeys)
      this.setRightsDialogVisible = true
    },
    // 通过递归形式获取三级权限Id
    getLeafKeys (node, arr) {
      if (!node.children) {
        return arr.push(node.id)
      }

      node.children.forEach(item => this.getLeafKeys(item, arr))
    },
    // 监听分配权限对话框的关闭事件
    SetRightDialogVisibleClosed () {
      // 清空 defaultkeys 数组  避免累积
      this.defaultKeys = []
    },
    // 点击为角色分配权限
    async allotRights () {
      const keys = [...this.$refs.treeRef.getCheckedKeys(), ...this.$refs.treeRef.getHalfCheckedKeys()]
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.rolesId}/rights`, { rids: idStr })
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败!')
      }
      this.$message.success('分配权限成功!')
      this.getRolesList()
      this.setRightsDialogVisible = false
    }
  }

}
</script>

<style lang="less" scoped>
.el-table{
  margin-top: 15px;
  font-size: 12px;
}

.el-tag{
    margin: 7px;
}

.bdtop{
    border-top: 1px solid #eee;
}

.bdbottom{
    border-bottom: 1px solid #eee;
}

.vcenter{
    display: flex;
    align-items: center;
}
</style>
